It's hard not to have a little nostalgic love for Tetris, but even if you don't you have to appreciate the modular nature of this DIY storage from Instructables user HicksCustomFurniture. With a set of block shelves you make yourself, you can assemble a storage system in pretty much any configuration you want.

If you have standard woodworking tools like a table saw, steel rule, a knife, a router with a dovetail bit, and a dovetail jig, you really just need some wood and paint to put these shelves together. The sample uses bright Tetris colors, but if you want something a little more subdued you can always paint them however you like. For full details on how to create these shelves, hit up the how-to on Instructables. If you're feeling particularly lazy and have some money to spare, you can buy them pre-made as well.